Unlock samsung i535 verizon ok 1.You need to root your phone if you want to have data conections if not skip this step. How to root instructions you have here: <Bạn vui lòng đăng nhập hoặc đăng ký để xem được nội dung này!> 2.From Google Play store install the following apps if you do not have them: APN Manager Pro (81 Square), Phone Info (sc@taiwan), Titanium Backup Pro. 3 Turn off phone, pull out battery and put in micro SIM from your foreign country. 4. Use Phone Info app to change preferred network type "Global" or "Gsm only" (click on Device Information and scroll down to the first box to change). Some have reported that other choices were needed for their providers, so you may have to experiment. 5. Reboot phone. You should have the SIM card working for phone calls. 6. In Titanium Backup Pro, go to Backup/Restore, find and “long select” APN Manager Pro, and then select “Convert to system app”. 7. Open APN Manager Pro, select Insert APN, and input the data needed from your desired service provider. 8. Reboot phone. You should have the SIM card working for phone and data. 9. Remove notification "NON-VERIZON SIM" : Using Titanium Backup, delete(uninstall) or freeze an app called Setup wizard 1.0 (its icon is a red check mark with a magic wand) and that should remove the notification 10. Enjoy.